Transcript
LR9552LP GPS Module
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1.
INTRODUCTION..................................................................................................................1 1.1. FEATURES .......................................................................................................... 1 HARDWARE AND SOFTWARE ........................................................................................... 1 PERFORMANCE .............................................................................................................. 1 INTERFACE .................................................................................................................... 1
2.
MODULE ARCHITECTURE ..............................................................................................2 2.1. 2.2. 2.3. 2.4. 2.5.
3.
PERFORMANCE CHARACTERISTICS...........................................................................7 3.1. 3.2. 3.3. 3.4. 3.5.
4.
DIMENSIONS ....................................................................................................... 3 SOFTWARE FEATURES ........................................................................................ 3 ENVIRONMENTAL SPECIFICATION ......................................................................... 4 REFERENCE DESIGN ............................................................................................ 4 REGULATIONS COMPLIANCE ................................................................................. 5 POSITION AND VELOCITY ACCURACY ..................................................................... 7 DYNAMIC CONSTRAINS ........................................................................................ 7 ACQUISITION TIME 1 ............................................................................................. 7 TIMING 1PPS OUTPUT ......................................................................................... 8 SENSITIVITY ........................................................................................................ 8
HARDWARE INTERFACE POWER SUPPLY.................................................................9 4.1. I. II.
SPECIFICATIONS .................................................................................................. 9 Pin Positions ....................................................................................................................9 Pin Assignment.................................................................................................................9
5.
SOFTWARE INTERFACE.................................................................................................10
6.
MECHANICAL DRAWING AND FOOTPRINT ............................................................11 6.1.
7.
PACKAGE............................................................................................................................12 7.1.
8.
OUTLINE DRAWING ........................................................................................... 11 PACKAGE SPECIFICATIONS ................................................................................ 12
ROHS COMPLIANT INFORMATION ............................................................................13 8.1. ROHS SOLDERING PROFILE ............................................................................... 13 Reflow Profile.........................................................................................................................13
GLOSSARY..................................................................................................................................14
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LR9552LP Manual V02
1.
Introduction
The Leadtek GPS 9952LP module (LR9552LP) is a high sensitivity and very compact smart antenna module, with built in GPS receiver circuit. This 20-channel global positioning system (GPS) receiver is designed for a wide range of OEM applications and is based on the fast and deep GPS signal search capabilities of SiRFStarIII™ architecture. Leadtek GPS 9552LP is designed to allow quick and easy integration into GPS-related applications such as:
PDA, Pocket PC, and other computing devices Car and Marine Navigation Fleet Management /Asset Tracking AVL and Location-Based Services Hand-Held Device for Personal Positioning and Navigation
1.1. Features Hardware and Software Based on the high performance features of the SiRFStar III/LP single chip Compact module size for easy integration: 25x25x8.9 mm (with 4 mm patch antenna) 25x25x6.9 mm (with 2 mm patch antenna) [option] Fully automatic assembly: reflow solder assembly ready Hardware compatible with SiRF GSW3.2 serial software
Performance Cold/Warm/Hot Start Time: 1/38/42 sec. Reacquisition Time: 0.1 second. RF Metal Shield for best performance in noisy environments.
Interface RS232 or TTL (option) level serial port for GPS communications interface Protocol: NMEA-0183/SiRF Binary (default NMEA). Baud Rate: 4800, 19200, or 57600 baud (default 4800).
© 2006 Leadtek Research Inc. All rights reserved. Preliminary Confidential - Information is subject to change without prior notice.
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Module architecture 9552LP ( RS232 ) Block Diagram 16.369MHz TCXO
25mm Patch Antenna
32.768KHz Crystal
bandpass filter
LNA
RS232 Transceiver
SiRF GSC3f / LP
2.85 VDC regulator
NMEA output
1.50 VDC regulator
voltage detector
backup battery
5.0VDC power in
9552 ( TTL ) Block Diagram 16.369MHz TCXO
25mm Patch Antenna
LNA
2.
32.768KHz Crystal
bandpass filter
serial IO
SiRF GSC3f
2.85 VDC regulator
voltage detector
NMEA output
1.50 VDC regulator
backup battery 5.0VDC power in © 2006 Leadtek Research Inc. All rights reserved. Preliminary Confidential - Information is subject to change without prior notice.
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2.1. Dimensions The Physical dimensions of the Leadtek 9552LP GPS Module are as follow: Items
Description
Length
25.0 ± 0.3 mm
Width
25.0 ± 0.3 mm
Height Weight
8.90 ± 0.3 mm 6.90 ± 0.3 mm 13.0g (w/ 4mm patch antenna) 8.0g (w/ 2mm patch antenna)
2.2. Software Features The Leadtek 9552LP module includes GSW3.2., high sensitivity software solution. For SiRFStarIII/LP receivers, the default configuration is as follows:
Item
Description
Core of firmware
SiRF GSW3.2
Baud rate
4800, 9600, 19200, 38400 or 57600 bps (default 4800)
Code type
NMEA-0183 ASCII
Datum
WGS-84
Protocol message
GGA(1sec), GSA(5sec), GSV(5sec), RMC(1sec),VTG(1sec)
Output frequency
1 Hz
© 2006 Leadtek Research Inc. All rights reserved. Preliminary Confidential - Information is subject to change without prior notice.
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2.3. Environmental Specification Item
Description
Operating temperature rang (note)
-30 deg. C to +60 deg. C
Storage temperature range
-30 deg. C to +65 deg. C
Humidity
up to 95% non-condensing or a wet bulb temperature of +35 deg. C
Altitude
18,000 meters (60,000 feet) max.
Velocity
515 meters/second (1000 knots) max.
Jerk
20 meters/second3, max.
Acceleration
4g, max.
Note: The module can be operated between -30~+85degC, but higher temperature may cause internal Li backup battery deterioration that will influence the performance of GPS hot start.
2.4. Reference design The user can use a PMOS to control 9552LP power on or off as below: IRLML6402
VCC 5.0 VDC
To 9552LP pin7 VCC_5V
ON / OFF Control
© 2006 Leadtek Research Inc. All rights reserved. Preliminary Confidential - Information is subject to change without prior notice.
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2.5. Regulations compliance
RoHS: This device complies with the Restriction of Hazardous Substances (RoHS) directive that is enforced on 1st July 2006, saying all electronic products sold in the EU must with RoHS compliance.
© 2006 Leadtek Research Inc. All rights reserved. Preliminary Confidential - Information is subject to change without prior notice.
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FCC/CE: This device complies with the Federal Communications Commission (FCC), an independent United States government agency regulating interstate and international communications by radio, television, wire, satellite and cable, and CE, an European electromagnetic waves emission and immunity party, regulations.
Please note that the compliances of this device are for this SMD module itself only. The complete system compliance must be examined and certified whenever you put this SMD inside.
© 2006 Leadtek Research Inc. All rights reserved. Preliminary Confidential - Information is subject to change without prior notice.
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3. Performance Characteristics 3.1. Position and velocity accuracy 10 meters, 2D RMS Position
5 meters 2D RMS, WAAS corrected <5meters(50%).
Accuracy Velocity
0.1 meters/second
Time
1 microsecond synchronized to GPS time
3.2. Dynamic constrains
Dynamic Conditions
Altitude
18,000 meters (60,000 feet) max.
Velocity
515 meters/second (1000 knots) max.
Acceleration 4g, max. Jerk
20 meters/second3, max.
3.3. Acquisition time 1 Mode TTFF Hot (valid almanac, position, time & ephemeris) TTFF Warm (valid almanac, position, & time) TTFF Cold (valid almanac) re-acquisition
Leadtek 9101 GPS Module 1s 38 s 42 s 100 ms
(<10 s obstruction with valid almanac, position, time & ephemeris) Note 1: Open Sky and Stationary Environments.
© 2006 Leadtek Research Inc. All rights reserved. Preliminary Confidential - Information is subject to change without prior notice.
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3.4. Timing 1PPS output The 1PPS output width of the Leadtek 9552 GPS Module is 1µs.
3.5. Sensitivity Parameter
Description
Tracking Sensitivity
-158 dBm
Acquisition Sensitivity
-142 dBm
© 2006 Leadtek Research Inc. All rights reserved. Preliminary Confidential - Information is subject to change without prior notice.
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4. Hardware Interface Power supply Parameter
Leadtek 9552 GPS Module
Input voltage
3.2 ~ 5.0V DC input.
Current (typ) at full power (3.3V)
55mA
Battery backup voltage
1.65 ~ 5.0V DC input.
4.1. specifications I. Pin Positions
Pin 7 Pin 1
II. Pin Assignment Pin No. 1 2 3 4
Define GND TXDA RXDA TXDB
Pin No. 5 6 7
© 2006 Leadtek Research Inc. All rights reserved. Preliminary Confidential - Information is subject to change without prior notice.
Define RXDB TIMEMARK VCC_5V
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5. Software interface The host serial I/O port of the module’s serial data interface supports full duplex communication between the module and the user. The default serials are shown in Table 5-1.
Port
Protocol
Port A Port B
NMEA 0183, 9600 bps N/A
Description GGA, GSA, GSV, GLL, RMC, VTG N/A
Table 5-1 Leadtek 9552LP GPS module default baud rates
The Leadtek LR9552LP module includes GSW3 high sensitivity software solution. Features include: High tracking sensitivity High configurability 1 Hz position update rate Real-time Operating System (RTOS) friendly Capable of outputting both NMEA and SiRF-proprietary binary protocols Designed to accept custom user tasks executed on the integrated ARM7TDM1 processor Runs in full power operation or optional power saving modes GSW3 default configuration is as follows:
Item Core of firmware Baud rate Code type Datum Protocol message Output frequency
Description GSW3.2 serial 4800, 9600, 19200, 38400 or 57600 bps (default 4800) NMEA-0183 ASCII WGS-84 GGA(1sec), GSA(5sec), GSV(5sec), RMC(1sec),VTG(1sec) 1 Hz
© 2006 Leadtek Research Inc. All rights reserved. Preliminary Confidential - Information is subject to change without prior notice.
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6. Mechanical drawing and footprint 6.1. Outline Drawing Items
Description
Length
25.0 ± 0.3 mm
Width
24.0 ± 0.3 mm
Height
8.90 ± 0.3 mm 6.90 ± 0.3 mm
(4mm patch antenna)
(2mm patch antenna)
© 2006 Leadtek Research Inc. All rights reserved. Preliminary Confidential - Information is subject to change without prior notice.
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7. Package 7.1. Package specifications Tolerance: ±10mm
5.5 cm
5 cm
9 cm
Electric Specification: Surface impedance Relative humidity: 50% Relative temperature: 24℃ ~ 28℃ Bubble diameter: 1cm Color: pink With SGS Test Report Dimension: 90mm(W) x 55mm + 50mm (L)
© 2006 Leadtek Research Inc. All rights reserved. Preliminary Confidential - Information is subject to change without prior notice.
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8. RoHS compliant information By July 1, 2006, all electronic products sold in the EU must be free of hazardous materials, such as lead. Leadtek is filly committed to being one of the first to introduce lead-free GPS Products while maintaining backwards compatibility and focusing on a continuously high level of product and manufacturing quality.
8.1. RoHS soldering profile Reflow Profile High quality, low defect soldering requires identifying the optimum temperature profile for reflowing the solder paste. To have the correct profile assures components, boards, and solder joints are not damaged and reliable solder connection is achievable. Profiles are essential for establishing and maintaining processes. You must be able to repeat the profile to achieve process consistency. The heating and cooling rise rates must be compatible with the solder paste and components. The amount of time that the assembly is exposed to certain temperatures must first be defined and then maintained. The following is an example of a typical thermal profile.
© 2006 Leadtek Research Inc. All rights reserved. Preliminary Confidential - Information is subject to change without prior notice.
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Glossary A-GPS Assisted GPS or AGPS is a technology that uses an assistance server to cut down the time needed to find the location. Although GPS provides excellent position accuracy, position fixes require lines of sight to the satellites. In regular GPS networks there are only GPS satellites and GPS receivers. In A-GPS networks, the receiver, being limited in processing power and normally under less than ideal locations for position fixing, communicates with the assistance server that has high processing power and access to a reference network. Although dependent on cellular coverage, AGPS processing is quicker and more efficient than regular GPS. API An application programming interface is a set of definitions of the way one piece of computer software communicates with another. One of the primary purposes of an API is to provide a set of commonly used functions, such as to draw windows or icons on the screen. Programmers can then take advantage of the API by making use of its functionality, saving them the task of programming everything from scratch. Baud Rate Is a measure of the signaling rate, which is the number of changes to the transmission media per second in a modulated signal. For Example: 250 baud means that 250 signals are transmitted in one second. If each signal carries 4 bits of information then in each second 1000 bits are transmitted. This is abbreviated as 1000 bit/s. Dead Reckoning The process of estimating your position by advancing a known position using course, speed, time and distance to be traveled. It is figuring out where you will be at a certain time if you hold the speed, time and course you plan to travel. Differential GPS (DGPS) An extension of the GPS system that uses land-based radio beacons to transmit position corrections to GPS receivers. DGPS reduces the effect of selective availability, propagation delay, etc. and can improve position accuracy to better than 10 meters. EGNOS A satellite navigation system being developed by the European Space Agency, the European Commission, and EUROCONTROL. It is intended to supplement the GPS and GLONASS systems by reporting on the reliability and accuracy of the signals. According to specifications, horizontal position accuracy should be better than 7 meters. In practice, the horizontal position accuracy is at the meter level. It will consist of three geostationary satellites and a network of ground stations. Similar service is provided in America by the WAAS system. See WAAS. © 2006 Leadtek Research Inc. All rights reserved. Preliminary Confidential - Information is subject to change without prior notice.
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European Geostationary Navigation Overlay System See EGNOS.
LNA A special type of electronic amplifier or amplifier used in communication systems to amplify very weak signals captured by an antenna. It is usually located at the antenna and is a key component, which is placed at the front-end of a receiver system. Low Noise Amplifier See LNA. Multi-path mitigation Anticipating errors caused when a satellite signal reaches the GPS receiver antenna by more than one path. Usually caused by one or more paths being bounced or reflected off of structures near the antenna and occurs to some extent everywhere. The signal which traverses a longer path will yield a larger pseudo range estimate and increase the error. NMEA An U.S. standards committee that defines data message structure, contents, and protocols to allow the GPS receiver to communicate with other pieces of electronic equipment. National Marine Electronics Association See NMEA. 1PPS Pulse which is generated once per second. GPS and some radio clocks and related timekeeping gear have a pulse-per-second or PPS signal that is needed for high accuracy time synchronization. The PPS signal can be connected in either of two ways, either through the data leads of a serial port or through the modem control leads. Either way requires conversion of the PPS signal, Most GPS devices emit an rs-232 serial stream with some kind of timestamp format. Many GPS devices are small realtime systems with the satellite tracking done at high priority, positioning done at medium priority, and time output done at low priority. The timestamps often have +- 200 ms of jitter (variance in delay), and output a PPS signal on the exact second. SMD Electronic device components that are mounted directly onto the surface of printed circuit boards (PCBs). In the industry it has largely replaced the previous construction method of fitting components with wire leads into holes in the circuit board (also called through-hole technology). © 2006 Leadtek Research Inc. All rights reserved. Preliminary Confidential - Information is subject to change without prior notice.
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Surface Mount Device See SMD. TCXO An electronic device that uses the mechanical resonance of a physical crystal to create an electrical signal with a very precise frequency and can be embedded in integrated circuits. TCXO reduces the environmental changes of temperature, humidity, and vibration, to keep a stable output frequency. Temperature Controlled Crystal Oscillator See TCXO. Time To First Fix (TTFF) The time it takes a GPS receiver to find satellites after you first turn it on, when the GPS receiver has lost memory, or has been moved over 300 miles from its last location. Standard TTFF Timing consists of:
Mode
Requires
Timing
Snap Start
Hot + Clock + Sat Pos
3 minutes off
Hot Start
Warm + Ephemeris
30 minutes off
Warm Start
Position Accuracy
<500 KM
Time Accuracy
<2 hours
Almanac
<1 year
Nothing
N/A
Cold Start
Specifications are typical times assuming good satellite visibility and above threshold signal strengths. WAAS A system of satellites and ground stations that provide GPS signal corrections for better position accuracy. A WAAS-capable receiver can give you a position accuracy of better than three meters, 95 percent of the time. (At this time, the system is still in the development stage and is not fully operational.) WAAS consists of approximately 25 ground reference stations positioned across the United States that monitor GPS satellite data. Two master stations, located on either coast, collect data from the reference stations and create a GPS correction message. Wide Area Augmentation System See WAAS.
© 2006 Leadtek Research Inc. All rights reserved. Preliminary Confidential - Information is subject to change without prior notice.
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Leadtek Research Inc. 18F, 166, Chien-Yi Rd., Chung Ho, Taipei Hsien, Taiwan (235) ©2006 Leadtek Research, Inc. All rights reserved. Version 0.2 Jan. / 07
© 2006 Leadtek Research Inc. All rights reserved. Preliminary Confidential - Information is subject to change without prior notice.
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